Related Experiment Video
Updated: Jun 4, 2026
09:03
Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments
Published on: May 21, 2019
The developmental role of Agouti in color pattern evolution
Marie Manceau1, Vera S Domingues, Ricardo Mallarino
1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA.
Science (New York, N.Y.)
|February 26, 2011
Summary
Agouti, a pigment regulator, shapes animal color patterns by influencing melanocyte development during embryogenesis. Natural selection favors changes in Agouti
Area of Science:
- Developmental biology
- Evolutionary genetics
- Animal coloration
Background:
- Animal color patterns influence survival and reproduction.
- Mechanisms controlling color pattern formation and evolution are poorly understood.
- The Agouti protein is a known regulator of adult pigmentation.
Purpose of the Study:
- Investigate the role of Agouti in the developmental basis of color pattern evolution.
- Analyze how Agouti influences melanocyte differentiation and pattern formation.
- Understand the evolutionary significance of Agouti's developmental functions.
Main Methods:
- Genetic analysis of Peromyscus mouse populations.
- Functional studies of Agouti gene expression.
- Embryonic and adult pigmentation analysis.
Main Results:
- Ventral-specific embryonic Agouti expression creates a prepattern by delaying ventral melanocyte differentiation.
- Increased and regionally expanded Agouti expression prevents melanocyte maturation, leading to novel color patterns.
- These changes in Agouti expression are adaptive and favored by natural selection.
Conclusions:
- Agouti plays a crucial developmental role in establishing animal color patterns.
- Tissue-specific and temporal regulation of Agouti is key to evolutionary changes in coloration.
- Natural selection acts on developmental mechanisms involving Agouti to generate adaptive color diversity.
Related Concept Videos
01:39Epistasis
In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
02:41Lethal Alleles
Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
01:09Epistasis Analysis
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
01:20Mate Choice
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
02:37Gene Duplication and Divergence
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.